Multi-roll stands



Oct. 13, 1970 `.1. wocHNlK ETAL 3,533,263

Y MULTI-ROLL STANDS Filed June 13, 1967 l 2 sheets-sheet 1 Oct. 13, 1970J, WQ||N|K ETAL 3,533,263

MULTI-ROLL STANDS f Filed June 13. 1967 2 Sheets-Sheet 2 Z7 19' Z2 25 29Z8 27 26 23' United States Patent O 3,533,263 MULTI-ROLL STANDS JosefWochnik, Osterath, and Klaus Leifeld, Kaarst, Germany, assignors toSchloemann Aktiengesellschaft, Dusseldorf, Germany, a German companyFiled June 13, 1967, Ser. No. 645,663 Claims priority, applicationGermany, June 16, 1966, Sch 39,132 Int. Cl. BZlb 31 /16 ABSTRACT F THEDISCLOSURE A multi-roll stand, with two positively driven backing rollsand with working rolls frictionally driven by the backing rolls, theworking rolls being displaced out of the vertical plane containing theaxes of the backing rolls, and supported in the direction of thisdisplacement by intermediate rolls and supporting rollers journalled onsupporting bridges respectively. The supporting bridge and hence thesupporting rollers can be swung out of contact with the intermediaterollers. Force is applied horizontally to the bearings of the workingrolls to support the working rolls in the opposite direction.

This invention relates to a multi-roll stand, with two positively drivenbacking rolls, and with working rolls frctionally driven by the backingrolls, these working rolls being shifted out of the plane containing theaxes of the backing rolls, and bearing, in the direction of theirdisplacement, on intermediate rolls and supporting rollers journalled onrigid supporting bridges, respectively.

In the case of known designs, the supporting rollers are journalled on asupporting bridge rigidly connected with the housings. On the oppositeside, the working rolls on their bearings are provided with a pressingappliance, releasable for changing the rolls, and acting in thedirection towards the supporting rollers. This arrangement has thedisadvantage that the position of the Working rolls is dependent uponthe diameter of the other rolls, and therefore changes as Wear occurs.

Working rolls and backing rolls must be parallel to one another. Thisrequirement must be fulfilled all the more accurately, the smaller thediameter of the working rolls in relation to their length, and thethinner the rolled stock is. Since however the position of the Workingrolls is determined by the supporting bridge, whereas the position ofthe backing rolls is determined by the opposite force-closed bearing oftheir chocks in the window aperture of the housing, it is necessary thatthe bearings, located far apart on the roll housings and the supportingbridges, must be absolutely parallel to one another. This however isattainable only by expensive machining.

With this invention the disadvantages are obviated. In addition animprovement in the constructional and maintenance possibilities is aimedat.

According to the invention, this is attained by the feature that thesupporting bridges are so arranged between the housings that they can beswung away from the intermediate rolls.

Further, because the working rolls and the backing rolls arecollectively supported, by way of the individual chock, on a contactsurface of the housing window, their parallelism to one another isensured in a simple manner. Owing to the fact that the working rolls aresupported directly on the fixed contact surface, they are always held inthe same vertical plane, independent of the diameters of the other rollswhich are variable due to wear.

In a further development of the invention, the axes of the supportingrollers are carried on supporting plates,

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which are connected to the supporting bridge. The appliance for keepingthe supporting rollers in contact with the intermediate rolls may thusbe omitted. For changing rolls, or for maintenance, the intermediaterolls and the working rolls are rendered freely accessible by simplyswinging the supporting bridge out of the Way.

According to a further feature of the invention, the supporting bridgesare provided at their ends with carrying arms, which are rotatablysupported upon eccentric bolts accommodated in the housing, the endportions of the supporting bridges being constructed as pivots, aboutwhich is rotatably supported a ring with a flattening, with which isassociated the inclined surface of a wedge, vertically slidable on thehousing and connected with an adjusting element. In this Way theposition of the supporting bridge can be accurately adjusted in avertical direction by rotating the eccentric bolt and in a horizontaldirection by shifting the wedges.

A further advantage according to the invention is the fact that thebearings of the working rolls are arranged opposite to the supportingrollers on claws, which are vertically displaceable, and are guided onsupporting blocks secured to the chocks. A transmission lever isfulcrumed on the supporting block its rear side is acted on by a pistonof a pressure-oil cylinder arranged horizontally in the supportingblock, and its front side upon a projection of the verticallydisplaceable claw. In this way the working roll is held against thebacking roll even when the rolled stock has run out.

One constructional example of the invention is illustrated in theaccompanying drawings, in which:

FIG. l shows a side view, represented in section, of a roll stand; and

FIG. 2 shows a plan view, also in section.

Two working rolls 1 of a multi-roll stand are each supportedperpendicularly on their peripheral surface, against a backing roll 2,and horizontally, by Way of intermediate rolls 3 and 4, on supportingrollers 5, the working rolls being displaced out of the common verticalplane of the axes of the backing rolls 2 in the direction of thesupporting rollers 5. The supporting rollers S are journalled onsupporting plates 7, connected with an upper supporting bridge 6 and alower supporting bridge 6. The supporting bridges 6 and 6 are providedat their ends with carrying arms `8 and 9, and are rockably journalledwith their bearings 10 on eccentric bolts 12 arranged on the housings11. Endwise the supporting bridges 6 and 6 are constructed as journals,upon each of which is rotatably supported a ring 13 of adjustablediameter, with a contact surface 14. With the contact surface 14,adjustable in this Way in its inclination against a resistance, isassociated a wedge 15, vertically displaceable on the housing, andconnected by way of a rod 16 with the piston of an adjusting cylinder17. By displacing the wedges 15, the supporting bridge v6 or 6 can berocked, thus compensating for the wear of the roll. Thus the ring 13compensates for the altered inclination of the supporting bridge `6 or6', so that a satisfactory bearing on the wedge 15 is always ensured. Byrotating the eccentric 1.2, the vertical position of the supportingrollers 5 can also be readjusted.

For changing the rolls, the supporting bridge can be rocked out of thecontact range by completely removing the wedges, the lower supportingbridge 6 dropping by gravity and being held by the upper edges of thelower wedge, and the upper supporting bridge 6 being carried along bythe upper wedges, by way of a resilient tensile strip 18 in each case.

The intermediate rolls 3 are journalled in rockable arms 19, 19', inwhich also the intermediate rolls 4 are journalled in slide-blocks 20`displaceable therein. In the arms 19 are arranged compressed-aircylinders 21 which have on the rear side supporting forks 22 constructedas pistons for centering the bearings of the working rolls in relationto those of the intermediate rolls, which are displaceable. The upperarms 19 are held on the upper chock 23 by a tension spring 24, wherebythe intermediate rolls 3 and 4 are prevented from falling down lwhen thesupporting bridge is swung out.

For supporting the bearings of the working rolls in the oppositedirection claws 25 are provided, which are vertically slidable and areguided in supporting blocks 26 secured to the chocks 23 and 23. In thesesupporting blocks are arranged cylinders 27, the pistons 28 of whichexert, upon a transmission lever 29 fulcrumed in the supporting blocks26, a horizontal force which is transmitted as a vertical force directedagainst the supporting rolls 2 to the claws 25, and thus hold theworking rolls 1 against the backing rolls 2 when the rolled stock hasrun out.

Between the upper a-nd lower arms 19` and 19' are arrangedpressure-fluid cylinders 30, which support the upper arms 19, andprevent the intermediate rolls 3 and 4 falling down when the workingrolls 1 are being dismantled.

We claim:

1. A multi-roll stand comprising an upper and lower set of rolls, eachset containing: roll housings; a positivelyrdriven backing roll; aworking roll frictionally driven by the backing roll, the axes of bothupper and lower working rolls being displaced out of the vertical planecontaining the axes of both upper and lower backing rolls; a supportingbridge extending between the roll housings; supporting rollersjournalled on the supporting bridge; intermediate rolls interspersedbetween the working roll and the supporting rollers, the intermediaterolls and working roll being journalled as a unit so that the axes ofthe working roll and intermediate rolls are maintained in the sameplane; and means for mounting the supporting bridge on the housings sothat the bridge and corresponding supporting rollers can be pivotedcompletely out of contact with the intermediate rolls so that said unitis easily accessible, the mounting means including vertical andhorizontal adjustment means to selectively position the bridge andsupporting rollers in both the vertical and horizontal plane.

2, A multi-roll stand as claimed in claim 1 wherein the mounting meansfurther includes a carrying arm at each end of the supporting bridge;said vertical adjustment means being an eccentric bolt accommodated ineach housing, the carrying arms being rotatably supported and verticallyadjusted by these bolts; the end portions of the supporting bridge beingconstructed as journals and a ring rotatably supported upon each of thejournals, each ring being formed with a attened portion; said horizontaladjustment means being a vertically diplaceable wedge on each housing sothat each of the attened surfaces normally bears against the inclinedsurface of one :of the wedges and vertical movement of the wedgesubstantially horizontally adjusts the bridge and supporting rollers.

3. A multi-roll stand as claimed in claim 1 wherein the supportingbridge has a plurality of supporting plates connected thereto, thesupporting rollers being journalled between these plates.

4. A multi-roll stand as claimed in claim 1 and further comprisingchocks for the backing roll; supporting blocks secured to the chocks;claws slidable substantially vertically in the supporting blocks, andbearing against the journals of the Working roll in a direction oppositeto the bearing force exerted by the supporting rollers; transmissionlevers fulcrumed on the supporting blocks; cylinders arranged in thesupporting blocks and pistons slidable in the cylinders so that thepistons act on the transmission levers and vertically displace theclaws.

References Cited UNITED STATES PATENTS 1,905,129 4/1933 Biggert et al.72-237 2,927,489 3/1960 Teutsch 72-243 3,003,373 10/1961 Volkhausen72-243 3,049,949 8/ 1962 Volkhausen, et al 72-243 CHARLES W. LANHAM,Primary Examiner B. J. MUSTAIKIS, Assistant Examiner U.S. Cl. X.R.72-243

